A tercet is a three line stanza.
It's not a genre, nor a rhyming scheme, nor is it a figure of speech. Tercets usually have more than 4 syllables per line.
It is a COMPOUND SENTENCE as it is made up of two independent clause (a clause has a subject an a predicate and it does not need the other clause in order to convey meaning). This independent clauses are joined by the coordinating conjuction “and”.
The topic sentence is usually always in the first sentence of a paragraph. If you are meaning the book or any representations of the novel
I believe it would be C, is sometimes referred to as flat time
Laura's attempt at trying to use an English idiom reveals that she is eager to try English phrases and expressions.
She says "There's no use trying to drink spilt milk," and even though her use of the idiom is incorrect (it should be - there's no use crying over spilt milk), she still really wants to try and better her English speaking skills, which is always quite commendable.